E949 Range Stack Detectors

Range Stack Scintillator (RS)

Trigger Counters or T-counters
nominally define the fiducial acceptance. They are shorter than the
rest of the range stack counters, 20.2" (520mm) instead of
72"(1.82m). They are also only 1/4"(6.35 mm) thick instead of the
3/4"(1.905cm) for the rest of the RS. The T-counters are located at
a radial distance of 450mm.

The RSSC's are straw tube chambers, operated in limited-streamer mode. The time resolution of
50 ps (after the time-stretcher-circuit) allows a z-determination ~1 cm. These chambers
have a factor of ~10 times less mass than the old ones.